Active control of chirality in nonlinear metamaterials

作者：Zhu Yu; Hu Xiaoyong^*; Chai Zhen; Yang Hong; Gong Qihuang

来源：Applied Physics Letters, 2015, 106(9): 091109.

DOI：10.1063/1.4914343

An all-optical tunabe chirality is realized in a photonic metamaterial, the metamolecule of which consists of a nonlinear nano-Au: polycrystalline indium-tin oxide layer sandwiched between two L-shaped gold nano-antennas twisted 90 degrees with each other. The maximum circular dichroism reached 30%. Under excitation of a 40 kW/cm(2) weak pump light, the peak in the circular dichroism shifts 45 nm in the short-wavelength direction. An ultrafast response time of 35 ps is maintained. This work not only opens up the possibility for the realization of ultralow-power and ultrafast all-optical tunable chirality but also offers a way to construct ultrahigh-speed on-chip biochemical sensors.

• 出版日期2015-3-2
• 单位北京大学